I love them. My favourite header is the down right, I like the way it shows that Gridcoin is a network.
The secret identities are great for targeting an specific audience. For example explore for an astronomic website or cure for a medical website. I will change the message for the decode identity, I think break codes has a negative meesage, I would change it for something like verify encryption.
Thanks @ropaga! I like that header too - I have a few designs following that theme that I'll push out for community use so you should see those popping up on Steemit soon :)
You're right - they're a great way to target a specific audience! I like the ideas you've put forward - I'll reconsider 'break codes' too, I just quite liked the play between "write code / break codes" :)